Method and apparatus for generating decoupled filter parameters and implementing a band decoupled filter

A method for filtering an input signal to produce a filtered signal, comprising the steps of:

• (a) receiving a transfer function of a filter;
• (b) receiving a first plurality of desired filter control parameters, a plurality of center frequency values, wherein each of the plurality of center frequency values corresponds to a band pass frequency of a desired filter function, and a desired filter boost/cut level for each of the plurality of center frequency values;
• (c) generating a plurality of adjusted filter control parameters for a plurality of band pass filters in response to the first plurality of desired filter control parameters and the transfer function of the filter,
• wherein each of the plurality of band pass filters corresponds to one of the plurality of center frequency values and each of the plurality of adjusted filter control parameters is based upon a one of the first plurality of desired filter control parameters corresponding to a respective center frequency and a coupling error resulting from an adjacent one of the plurality of band pass filters;
• (d) receiving the input signal;
• and
• (e) enabling a filter to apply a first plurality of the plurality of adjusted filter control parameters to the input signal to provide the filtered signal having a desired signal characteristic.

A data processing system, comprising:

• bus means for communicating data and a plurality of instructions;
• an input/output port coupled to the bus means for receiving a plurality of filter control parameters, a transfer function of a filter, and input data, and wherein the input/output port transmits filtered data;
• a memory coupled to the bus means, wherein the memory stores the plurality of filter control parameters, the transfer function of the filter, a portion of the plurality of instructions, and data;
• and
• a data processor coupled to the bus means, the data processor receiving the plurality of filter control parameters, the transfer function of the filter, and the portion of the plurality of instructions from the memory and the data processor calculating a plurality of adjusted filter control parameters using the plurality of filter control parameters and the transfer function of the filter, the processor implementing the filter such that the filter uses the plurality of adjusted filter control parameters to filter the input data and accurately produce the filtered data having a signal characteristic corresponding to the plurality of desired filter control parameters, the data processor generating a band decoupling matrix based on the transfer function of the filter and applying an inverse of the band decoupling matrix to the plurality of desired filter control parameters to produce the plurality of adjusted filter control parameters.

A data processing system, comprising:

• bus means for communicating data and a plurality of instructions;
• an input/output port coupled to the bus means for receiving a plurality of filter control parameters, a transfer function of a filter, and input data, and wherein the input/output port transmits filtered data;
• a memory coupled to the bus means, wherein the memory stores the plurality of filter control parameters, the transfer function of the filter, a portion of the plurality of instructions, and data;
• and
• a data processor coupled to the bus means, the data processor receiving the plurality of filter control parameters, the transfer function of the filter, and the portion of the plurality of instructions from the memory and the data processor calculating a plurality of adjusted filter control parameters using the plurality of filter control parameters and the transfer function of the filter, the processor implementing the filter such that the filter uses the plurality of adjusted filter control parameters to filter the input data and accurately produce the filtered data having a signal characteristic corresponding to the plurality of desired filter control parameters
• wherein the plurality of filter control parameters comprise:
• a plurality of center frequencies, wherein each of the plurality of center frequencies represents a band pass frequency of a desired filter function;
• and
• a plurality of desired filter boost/cut levels, wherein each of the plurality of desired filter boost/cut levels corresponds to one of the plurality of center frequencies, and
• wherein the data processor generates the plurality of adjusted filter control parameters for each of a plurality of band pass filters, wherein each of the plurality of band pass filters corresponds to one of the plurality of center frequencies, each of the plurality of band pass filters using a corresponding one of the plurality of adjusted filter control parameters to filter a coupling effect of an adjacent one of the plurality of band pass filters from the filtered data.

A digital audio system, comprising:

• a control panel for receiving a plurality of external inputs, the control panel providing a plurality of desired filter control parameters;
• storage means for communicating and storing a decoupling matrix;
• a matrix multiplier coupled to the control panel for receiving the plurality of desired filter control parameters and coupled to the storage means for receiving the decoupling matrix, the matrix multiplier multiplying the plurality of desired filter control parameters and the decoupling matrix to generate a plurality of adjusted filter control parameters;
• input means for receiving an input signal;
• a filter coupled to the input means for receiving the input signal and coupled to the matrix multiplier for receiving the plurality of adjusted filter control parameters, the filter using the plurality of adjusted filter control parameters to filter the input signal and generate a filtered output signal.

A method for filtering a signal, comprising the steps of:

• receiving a decoupling matrix, wherein the decoupling matrix reflects a transfer function of a filter;
• receiving a first plurality of desired filter control parameters from a control interface;
• generating a first plurality of adjusted filter control parameters in response to the decoupling matrix and the first plurality of desired filter control parameters;
• receiving an input signal;
• and
• filtering the unfiltered signal using the first plurality of adjusted filter control parameters.